Adolph onslow



N. PETERS. PHOTO-L THUGRAPHER WASHlNGTON D C tuited gat-abat gaat aan.

ADOLPH ONSLOW, OF JERSEY CITY, NEW JERSEY.

' Leners P aam No. 103,647, dated May 31, 1ero.

DISENGAGING- VALVE-GEAR FOR LOCOMOTIVES.

The Schedule referred to in these Letters Patent and making partof the Same.

To all whom it may conce/rn specification, and which represents a sectional eleva' tion, taken longitudinally through the cylinder of a locomotive engine, Awithmain valve and gear for op*- erating the latter; also my improved disengaging-gear applied thereto.

My invention will here be described exclusively as applied to the main valves of locomotive'engines, and for the purpose of making-it more easily understood, the same will be shown as applied to an ordinary main slide valve, operated by a rod and rocker as' usual in locomotive engines.

The object ot' the invention is to relieve in an automatic manner the main valve or valves `from unnecessary work and friction, when the=engine is running any considerable distance or time without the assistance of steam; as, for instance, in the case of a locomotive engine traveling by its momentum down an inclined plane, which object it accomplishes by setting the valves at rest, thereby relieving them and their rods, joints, and operating parts from all strain The inventionv consists, in a combination with the main valves operating mechanism, of a cylinder and piston, or other suitable devices, under control, as regards the moving part, of. steam from the boiler to innence its motion in the one direction, and of steamsupply at any point between the throttle-valve and the induction ports of the engine-,to influence its motion in a reverse direction, so that the action of opening and closing the throttle-valve' will, in the application of the invention to, for instance, an ordinary locomotive valve-gear, raise and lower the valve-rod for the purpose of either setting the valve at rest by disengaging the valve-rod with its rocker, or of connecting said rod tov -its rocker ready for operation of the main valve.

The arrangement, too, is such that not' only is the' rocker-shaft free to perform its ordinary travel, when the engine is running without the aid of steam,` and the main valves are relieved from work; but said valves, when relieved or stopped during the running of the engine, as described, are' arrested in a covered position of the ports, which prevents the admission of cinders or` hot-air from the smoke-box of the engine, and thereby obviates injury alike to the valve faces and cylinders of the engine.

ReferringV to the accompanying drawing- A represents an upper, and B a lower cylinder, both connected to work in unison, and the lower one, B, of which is of larger area than the upper one.

C and D are double pistons, arranged to iit said cylinders. These pistons are hung by trunnions a a', in ahollow support, E, which has a central transverse relation with the' valve-rod F, and through a slot,.b, in which said rod travels when operating the valve, the sides of such slot also serving to guide the valve-rod in its up-and-down motion. p Y

The areavofthe upper piston G is in such proportion smaller than the lower piston D, that when steam is admitted to the lower piston from the steam-chest, even at a comparatively lower pressure than the steam admitted to the top piston directly from the boiler, the lower piston, D, will have'an aggregate pressure in excess of that on the upper piston.

'lhe pistons C and D, under-'this arrangement, are stationary, and the double cylinder A B `is free to move up and down, but the parts maybe arranged to have the pistons move instead of their cylinders.

The upper cylinder A is shown connected with the lower cylinder B by a coupling-nut, c.

The valve-rod F is connected, by means of a slot,- d, in it and piu e, fast to. the lower cylinder B, with the-latter, so that when said rod is being worked by the rock-shaft G, through the rocker H, it is free to play without interference by the pin c.

,'.lhe lower cylinder B is slotted, as at f, to allow of its up-and-down play past the trunnions a a of the stationary pistons. These trunnions, which are held stationary in the stationary-support E, are made hol--` low. The one, a., of them communicates, by a passage, g, with the upper cylinder A, and the other, a', by a passage, h, with the lower cylinder B.

The hole in the trunnion a which leads to the upper cylinder A, is in communication, by a pipe, i, with the steam-dome of the boiler, while the hole vin the other trunnion, a', which connects with the lower cylinder B, is in communication, by a pipe, k, with the steam-chest I, or may otherwise connect at any convenient point between the throttle-valve `and the induction ports ofthe engine cylinder J .n

The steam communication from the boiler to the upper cylinder A is permanently open, Ybut may be closed, if found necessary, -by a suitable cocl{pr ovided for the purpose.A v

This steamof boiler pressure, which for'the sake of illustration may be stated at one hundred pounds to the square inch, will exert on the upper cylinder and its piston, when of two inches in diameter, a force of about three hundred and fourteen pounds to raise the double cylinder A B, with whichthe valve-rod F is connected by means of the pin e, and so lift the valve-rod out of gear with the rocker H, and in thus disengaging the valve-rod, which occurs whenever the throttle-valve is closed by reason of pressure being shut'o" from the lower cylinder B, the mainvalve K is set or made to occupy a central position over and so as to close the ports, by means of a suitably-constrncted guide or slotted projection, Z, from the valverod acting against a stationary pin, lm, in the support E, and hookingr of such guide l on said pin from beneatli.

When the throttle-valve is opened, and steam flows to the steam-chest I, it will,ot` course, also pass to the lower cylinder B by the trunnion a. and hole through the piston D; and supposing this lower cylinder B to vbe two and a half inches diameter, as against twinches diameter for the upper cylinder A, and the steam in the chest I seventy-five pounds, as against one hundred pounds pressure in the boiler, there would then he an excess of about fifty-three pounds aggregate force on the lower cylinder, plus the weight of the double cylinderto depress the latter, which action drops the valve-rod F. into 1. The combination of the cylinders A B and pis- .ton O D, in steam communication, respectively, with the engine and boiler, the valve-rod F, and rocker or driverH, to operate-substantially as specified. l

2. The combination, with theelements recited iii the previous claim, of the guide l and pin m, essen'- tially as and for the purposeherein set forth.

. v A. ONSLOW.

Witnesses FRED. HAYNES, HENRY PALMER.

W' hat is here claimed, and desired to be secured by VLetters Patent, is- 

